"Unfortunately, the file sizes for lossless files are significantly larger, and I have to be cost-conscious when it comes to storage costs."
Could this be included in a membership fee? So the costs are covered?
Why it must be Wave!? I hear the music perfectly with an mp3,
I do not think Dr_J has the purpose that this site should be a place to backup your music
If you collaborate with someone you can send the wave tracks directly to the person
with https://wetransfer.com/ or https://filetransfer.io/ no need to upload them here, to save space and cost :)